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问题 单项选择题

当对商业餐厅的厨房热加工间设置空调系统供冷/供热时。应选择哪种空调系统

A．一次回风全空气系统
B．二次回风全空气系统
C．直流式全空气系统
D．新风加风机盘管系统

答案

参考答案：C

改错题

Dear Ralph,

I'm a newcomer here of a small town. I would describe myself as shy and quietly. ＤBefore my classmates, it seems always difficult for me to do things well as            them. I'm sure they will laugh to me and see me as a fool. So I feel unhappy every day. Besides, I have few friends. I don't know that they don't like to talk with me.

Sometimes, we talked to each other very well in class, but after class we become stranger at once. I am trying to improve the situation since it doesn't seem to work. Can you tell me about what I should do?     

Yours,

Xiao Wei
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单项选择题

介质双向流动的管道应选用（）。

A、闸阀

B、截止阀

C、止回阀

D、安全阀
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